England and Wales

Created by: Supakicka1
Created on: 08-12-18 16:36

1. What direction of subduction is inferred from Ordovician volcanism in the Lake District?

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2. Name the 2 groups of volcanic rocks in the Lake District. How are they different?

Eycott Group of basalts and basaltic andesites erupting closer to the trench than the Borrowdale Volcanic Group dominated by andesites (2 marks)

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3. What is the evidence for deformation of Lake District strata and when did it occur?

All Silurian and Ordovician fine-grained strata have penetrative NE-SW cleavage that is axial planar to major folds. Deformation must be Lower Devonian, as it post-dates uppermost Silurian (415 Ma) sediments but is cut by mid-Devonian Shap granite (3

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4. The Precambrian volcanic arc of Wales and central England was dominant for which time period?

680-560 Ma (1 mark)

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5. What are the main components of the Gwna Melange on Anglesey?

Olistostrome with km-sized blocks of stromatolitic limestone, quartzite, greywacke and pillow basalts (2 marks)

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6. England and Wales (Avalonia) and Scotland (Laurentia) were at very different latitudes during the upper Ordovician (Caradoc-Arenig) period. What lines of evidence were used to reach this conclusion?

Palaeomagnetic data, tropical and high-latitude fossils and carbonates (2 marks)

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Other cards in this set

Card 2

Front

2. Name the 2 groups of volcanic rocks in the Lake District. How are they different?

Back

Eycott Group of basalts and basaltic andesites erupting closer to the trench than the Borrowdale Volcanic Group dominated by andesites (2 marks)

Card 3

Front

3. What is the evidence for deformation of Lake District strata and when did it occur?

Back

Card 4

Front

4. The Precambrian volcanic arc of Wales and central England was dominant for which time period?

Back

Card 5

Front

5. What are the main components of the Gwna Melange on Anglesey?

Back

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England and Wales